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BRUSH FOR APPLYING SENSITIZING SOLUTIONS.

No. 541,670. Patentd June 25, 1895.

N r r u "I. Q

UNITED- STATES PATENT Y OFFICE.

EDWARD A. OSSE, OF BALTIMORE, MARYLAND.

BRUSH FOR APPLYING SENSITIZING SOLUTIONS.

SPECIFICATION forming part of Letters Patent No. 541,670, dated June 25,1895.

Application filed March 23, 1895- Serial No. 542,881. (No model.)

To all whom it may concern.-

Be it known that I, EDWARD A. OSSE, a citizen of the United States,residing at Baltimore, in the State of Maryland, have invented certainnew and useful Improvements in Brushes for Applying SensitizingSolutions, of which the following is a specification.

This invention relates to an improved brush for applying sensitizingsolutions to paper or fabrics; and the objects of the invention are,first, to provide means which will enable the work to be done withoutliability of the salts and acids contained in the different solutionsemployed in sensitizing coming in contact with the hands of theoperator, as is the case when using-an ordinary sponge; second, toinsure an even and uniform spreading of the solution, and, third, toprovide for increasing or dimishing the flow of the fluid and fordrawing up any excess or surplus of fluid that may be on the papersurface by suction, somewhat on the principle of soaking with a spongeor blotting paper.

In the preferred form of brushes the solu tion is controlled either forfeeding to the paper or withdrawing from the paper, by the manipulationof a forked spring handle, or, when the handle is omitted, bycompressing the two sides or relaxing the pressure on the sides of thebrush-body. The solution is distributed upon the paper by a porousfabric spreader or smoother. In these brushes it is necessary that theporous spreader or smoother be frequently and thoroughly cleansed and inconsequence of deterioration and wear it has to be renewed.

The invention is illustrated in the accompanying drawings, in whichFigure l is a side elevation of the improved brush with handle. Fig. 2is a cross-section taken through the center of the brush and handle.Fig. 3 is an end view of the brush without handle. Fig. 4 is a view of amodified hinge-link connection. Fig. 5 is a bottom edge view of part ofone side of the brush, showing the notches. Fig. 6 is a crosssection ofthe brush without the handle, showing the porous distributor applied ina modified form.

The holder or body of the brush consists of two sides, A, A, which areof some suitable stifi or inflexible material as wood,.metal or gutlapercha. In cross-section the body is nearly V-shaped and at the bottomor narrowest part the lower edges, b, are separated and form alongitudinal slot, 0, and the sides diverge or spread apart as theyextend up. These sides, A, are united by a suitable'elastic or flexiblematerial, B, such as rubber or leather which extends all along the edgesof the ends and top and may be secured by cemout or by screws or tacks,making an air-tight joint. In the present instance, a thin metallicstrip, 0, is held by tacks, cZ, as shown. At each end the two sides, A,are jointed at their lower edges by a plate, c, Fig. 3, or a modifiedplate link 6', Fig. 4. These plates (whichever form is used) keep thetwo sides, A, in proper relative position and allow said sides to have ahinged or jointed movement.

The porous distributer, D, in Figs. 1, 2 and 3, comprises a piece offelt or other fabric folded to form a loop, f, and the two edgesinserted into the longitudinal slot, 0, and filling or closing saidslot. The inner surface of each side, A, has a longitudinal groove, g,see Fig. 2, and at short intervals are notches, h. Two strips or beads,g, are secured lengthwise of the porous distributor so as to make onopposite sides thereof a bead ed edge which fits into the saidlongitudinal groove, g, on the side. These strips or beads, g, serve toretain the porous distributor in the slot, while the loop part, f,projects therefrom. This part is flexible and. serves as the brush orsweep. The porous distributer, D, may be made to encircle the bottomedges and cover the longitudinal slot, as in Fig. 5. In this case clamppieces, I, are secured to the sides by screws or tacks, j.

The handle, K, comprises a forked flat spring, Z, folded at, Z, and theends, Z secured, respectively, to each side of the body or holder, A, bymeans of screws, m, solder, or the like, as the case may require. Forgreater convenience suitably shaped grasping pieces,

Instead of the spring described, a coil spring,

n, see Fig. 6, between ,the sides, A, would answer the same purpose. Bythe construction of the holder composed of the two longitudinal sides,A, elastic strip, B, and joint plates, the capacity for compression andexpansion is very evident. The flexible or elastic strip, B, may be madeto bend or fold inward or outward of the sides, A, (see the bulge, 0, inFig. 3) on these sides being compressed.

The operation of the brush is as follows: The flexible spreader ordistributer, D, is dipped in the sensitizing solution or other fluid,and the space or chamber in the holder is charged by first compressingthe handle, K, or the sides, A, and then relaxing the pressure whichcauses an inward suction of the fluid through the spreader. The brushbeing charged, the distributer, D, is drawn over the surface of thepaper or fabric to he sensitized. By compressing the handle, K, or thesides, A, the solution is fed to the paper which thereby is quicklycoated. When too much of the sensitizing fluid has been expressed andthere is a surplus amount on the surface of the coated paper or fabric,which on drying would disflgure the sheet by showing blotches, the brushbeing now partly compressed, by drawing it evenly over the surchargedsheet and at the same time gradually relaxing the pressure on thehandle, K, or sides, A, the suction thus produced will take up all thissurplus fluid, leaving an evenly coated surface.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is-

1. A sensitizing brush consisting of a holder having two stiff orinflexible parallel sides whose lower edges are separated to form a slota strip of elastic or flexible material uniting the ends and tops ofsaid sides-leaving the tops of the stiff sides compressible toward eachother; and a porous fabric distributor closing the said slot andprojecting therefrom.

2. Asensitizing brush consisting of a holder havingtwostifi orinflexible longitudinal sides whose lower edges are separated to form aslot; a joint plate at each end jointing the two sides at their loweredges where the slot is 'formed; a strip of elastic or flexible materialuniting the ends and tops of said sidesleaving the sides compressibletoward each other; and a porous fabric distributer, D, closing the saidslot and projecting therefrom.

3. Asensitizing brush consisting of a holder having two longitudinalsides whose lower edges are separated to form a slot; a strip of elasticor flexible material uniting the ends and tops of said sides-leaving thesides compressible toward each other; a porous fabric distributer, D,closing the said slot and projecting therefrom; and a two-part handleeach part of which is attached to one of the sides.

In testimony whereof I affix my signature in the presence of twowitnesses.

EDWARD A. ossn.

Witnesses:

CHARLES B. MANN, J r., C. CALVERT HINES.

